The Terminator already had a heads-up display; that's why he didn't need to steal a pair of these when he came back in the second movie.

Besides, he had a nice collection of Sights--not very tasteful sunglasses with crosshairs added into the lens on your dominant eye. They did wonders for marksmanship, and they were real obvious too, so that everyone knew you didn't [mess] with a man wearing Sights.